Syringe assembly



United States Patent 2,772,677 SYRINGE ASSEMBLY Izaak A. Ulert, Walter J. Haldas, and Walter J. Larke, Houston, Tex.

Application February 18, 1953, Serial No. 337,466

8 Claims. (Cl. 128-215) The present invention relates to a syringe assembly and more particularly to a hypodermic syringe assembly which allows a medicinal solution to be made extemporaneously.

The present invention relates generally to syringe assemblies having separate compartments which contain dissimilar ingredients to be mixed into a desired injection solution, the solutions contemplated being those which are not stable in prolonged storage or which must be refrigerated.

- It is therefore a general object of the present invention to provide an improved syringe assembly by which a medicinal solution may be made quickly and readily by the practitioner at a time when the injection is to be made.

and readily attached to the piston or plunger to serve as a handle for actuating the plunger.

Other objects and features will be apparent from the following description of an example of the invention given for the purpose of disclosure, taken in connection with the accompanying drawing, where like character references designate like parts throughout the several views,

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18 of reduced diameter which may be of cylindrical shape and which snugly and slidingly fits into the upper end of the solvent container 12.

As illustrated, the container 12 may be of substantially tubular configuration, open at one end through which the reduced diameter portion 18 slidably extends. The cylinder 20'is outwardly flared at its open end to provide an outwardly extending ring-like member 22 which serves as a finger grip when operating the syringe assembly.

Snugly fitting, but slidably disposed in the cylinder 20, is the tubular sleeve 24 through which the injection needle 26 of the syringe 10 extends, when the parts are in the position illustrated in Figures 1, 3 and 4.

Slidably disposed below the sleeve 24 is the diaphragm 28, which may be formed of any suitable material which may be pierced by the needle 26, such as rubber or resilient material, which diaphragm snugly fits within the cylinder 20 and should have the properties of sealingly engaging the inner walls of the cylinder 20, and the needle 26 when pierced, to prevent leakage of the solvent 30 provided therebelow in the closed end of the cylinder 20. If desired, the sleeve 24 and diaphragm 28 may be formed of one piece, it only being necessary to provide means to move the diaphragm downwardly after it has been pierced.

The diaphragm 28 has the recessed portion 32 at its inner side to permit movement of the end of the injection needle 26 thereinto and thereby prevent it from being damaged by striking the closed end of the cylinder 30 when it is being inwardly pushed in the cylinder 20.

If desired, and for ease of handling in shipping, and to avoid premature mixing, locking means may be provided to lock the parts in what may be termed assembled position, as illustrated in Figure 1, and this may be accomplished by providing the locking pin 34 through a portion of the head member 18 of the syringe 13 and the wall of the cylinder 20, as at 36. Obviously, any satisfactory means of locking the parts may be utilized.

A bleeder passage 38 may be provided in the plunger head 14 to permit gases to be expelled which are formed when the ingredients are mixed, and an outwardly projected threaded boss 40 may be provided to which the threaded recess 42 at the lower end of the container 12 may be threadedly secured so that the container 12 is threaded to the plunger head 14 and serves as a handle Figure 4 is a fragmentary view similar to Figure 3 but illustrates the parts in a position where substantially all of the solvent has been expelled from the solvent container, and

Figure 5 is a fragmentary view illustrating the solventcompartment secured to the plunger to provide a handle therefor.

Referring now to the drawing, the hypodermic assembly includes a syringe, generally designated by the reference numeral 10, and what may be termed a solvent container, generally designated by the numeral 12 which may be secured together in the manner illustrated in Figure 1. These members may be formed of any suitable and customarymaterial, such as glass and the like.

The syringe 10 contains the barrel 13 having the plungtherefor, as best seen in Figure 5. While threads are illustrated, any conventional means may be provided to secure the container 10 to the plunger head 14.

The syringe assembly 10 may be assembled in the manner illustrated in Figure 1 in which a powdered medicant 44 may be provided in the syringe 13 and a suitable solvent 30 may be provided in the container 12. When it is desired to use the hypodermic assembly, the pin 34 may be removed, and the syringe 13 may be moved inwardly into the solvent container 12. The first movement will pierce the diaphragm 28, which is supported in position by the solvent 30 therein, and slide the sleeve 24 downwardly into the position illustrated in Figure 3 by the engagement of the outer end of the head member 18 engaging the outer end of the sleeve 24. Subsequent inward movement of the syringe 13 into the solvent container 12 will cause a corresponding inward movement of the sleeve 24 which engages and moves inwardly the diaphragm 28 thereby forcing the solvent 30 upwardly through the passage in the injection needle 26 and the head member 18 into the syringe 13. When the syringe has been moved inwardly to the position illustrated in Figure 4, substantially all the solvent will be forced into the syringe 12 and, by shaking, the powdered medicament 44 and solvent may be. thoroughly mixed to provide a fresh solution of medicant.

Thereafter, with the injection needle 26 held in an uppermost position, the container '12 :may be removed, sleeve .24 having sufficient frictional contactwith-';the inner wall of the cylinderzfl' to retain the diaphragm 28 in place so that :the injection needle -26 willtreadi'ly be removed .therefrom. The container 12;may then be threadedly or otherwise secured to-the plunger head- 14, as illustrated in Figure 5, While the injection needle '26 is held in an uppermost position, which permits entrapped air to escape through-the needle. The assembly is then complete-and the syringe prepared for maki-ng an injection in the usual manner.

Any-desired measured amount of fluidand powder to provide a desired amount of mixture of desired characteristics may be provided by merely varying the size or-sizes of the two chambers and the travel distance of the various parts. The variable factors, of course, maybe provided in the manufacture of the syringe assembly.

-As illustrated in Figure 4, a paster 44' may be applied overthe recess 42 and a suitable sterlizing agent,-such as merthiolate, provided therein, so that the place of injection of the patient maybe sterilized. In addition, if the-bleeder passage 38 is provided, it should be covered by a suitable cover when the syringe assembly is not in use. Preferably, the entire syringe assembly maybe enclosed in a sterile package before use.

In using the syringe assembly of "the present invention, the operator is assured of a fresh solution and completely'sterile parts for administering a measured amount of solution of the desired characteristics. Thus, the present invention is well suited to attain the objects and features set forth and others inherent therein.

While only one example of the invention has been given for the purpose of disclosure, various rearrangement and substitution of parts may be made. Thepresent invention is, therefore, to be limited only by the spirit thereof as defined bythe scope of the appended claims.

What is claimed is:

l. A hypodermic syringeassembly comprising,'in combination, asyringe including a barrel, a plungervmovable in the barrel, a projecting head member on the barrel, and an injection needle extending from'the head member; and a container movably and releasablyconnected to the head member and movably receiving said-head memher and needle when the syringe assembly -is in assembled position, a diaphragm closely fitting andslidable inthe container adapted to be pierced by the needle, means slidably disposed in-the container 'between the head member and the diaphragm .andthroughwhieh the needle extends when the diaphragm is pierced by :the needle, said means being engageable bysaid headlmemher and said diaphragm,inwardmovement of saidneedle and said head member in said. containerservingto pierce the diaphragm and to move-said means and thereby said diaphragm inwardlythereby forcingliquid 1insthe containerthrough the needle into the barrel and into contact with medicament in the barrel. 7

2. A hypodermic syringe assembly comprising, in combination, a syringe including 'a barrel, a plunger movable in the barrel, a projecting head member onthe barrel, and an injection needleextending fromthe head member; and acontainer movably and releasablyconnected to the head member and slidingly receiving said head member and needle when the syringe assembly is in assembled posit-ion, a diaphragm closely .fitting'and slidable in the container adapted to be pierced by the needle, a sleeve slidably disposed in the container between the head member'and the diaphragm through which the needle-extends when-the diaphragm is being pierced, said sleeve being engageable with. said hea'd member and said diaphragm, inward -.movement of said needle :and

-saidheadmember insaid container serving to pierce the diaphragm and move said sleeve and thereby the diaphragm inwardly thereby forcing liquid in the container through the needle into the barrel and into contact with medicament therein.

3. The hypodermic syringe assembly of claim 2 including means releasably-engaging said syringe and container to lock the syringe and container in assembled posmon.

4. The hypodermic syringe assembly ofclaim 2-where the container is connectable with the plunger whereby upon connection thereof the container serves as a handle for the plunger.

5. A hypodermic syringe assemblycomprising, in combination, a syringe including a cylindrical barrel, a plunger head movable in the barrel, a cylindrical projecting head member of less diameter than that of the barrel extending therefrom, and an injection needle extending from :the head member; and a cylindrical container releasably and slidably connected to thehead membet and slidingly receiving said head member andneedle when the syringe is assembled, a resilient diaphragm closely fitting and slidable in the container adapted to be pierced by the needle, said diaphragm having a recessed portion ,at its inner portion for reception of the needle, a .tubularsleeve snugly fitting and slidably disposed in the container between the head member and :the diaphragm and through which the needle extends when the diaphragm is being pierced thereby, saidsleeve being engageable with said head member andsaid diaphragm, inward movementof the needle and the head member in said container serving to pierce the diaphragm and move-the sleeve inwardly and thereby the diaphragm .inwardlyihereby forcingliquid in the container through the needle and into the barrel into contact with medicament therein.

6. The hypodermic syringe assembly of claim 5 including-means on the container and plunger head :for

connecting the container to the plunger whereby on disconnection of the container from the head member and connection of :the container with the plunger head the container serves as .a handle for the plunger.

7. The hypodermic syringe assembly of claim 5 in- .cluding releasable locking means associated with the syringe and container for locking the syringe andcontainer in assembled position.

-8. A hypodermic syringe assembly comprising, incombination, a syringe including a-barrel,a plunger movable in the barrel, .a projecting head member on the barrel, .and an-injectionneedle extending from the head member; and a container releasably and movably connected to said syringeand movably receiving-said head mem- .ber and needle whenthe syringe is assembled, and a diaphragm :closely fitting and .movably disposed .in .the

container adapted to be pierced by the needle, saiddia- .phragm being engageable by said needle, inward movement-of the needle in the container serving toeffect'en- .gagement of the needle with theldiaphragm and to pierce and move the diaphragm inwardly thereby forcing-liquid in the container through'the needle andinto the barrel into contactwithmedicamenttherein; and means on .the

plunger and container for connecting the container (to .the plunger whereby .upon connection lthereof the ,con-

tainer serves ,as a handle for the plunger.

References Cited in the file of this ,patent :UNITED STATES PATENTS '2;55l,414 Burnside May 1, 1951 2,627,857 Mercelli Feb. 10, 1 953 FOREIGN PATENTS 9581355 "France Mar. '8, 1950 1,003,347 France Nov. '14, 1951 

